Year	% of output
1971	17.576243980738365
1972	17.097869712874346
1973	16.272076111323745
1974	14.903519322282069
1975	16.47080176051545
1976	18.043744976096797
1977	17.376531974274968
1978	17.020136283592375
1979	20.694197457682936
1980	24.14611322772542
1981	27.62661679912732
1982	21.25155432173737
1983	21.59425377366133
1984	25.936599423631122
1985	21.22506791743098
1986	19.935883735840992
1987	20.880665408756595
1988	20.96321138557396
1989	19.322677129900622
1990	16.12115409580683
1991	16.363359902685744
1992	18.53755429490053
1993	16.801474591298668
1994	18.153531717584613
1995	18.715079670086027
1996	19.58907944365865
1997	20.477322185316687
1998	23.476819315347992
1999	22.408750913896856
2000	20.564906840895876
2001	21.60396456082236
2002	22.313375639964438
2003	20.753739211236397
2004	20.232046543310517
2005	19.302509822097427
2006	19.26177012715174
2007	15.240209715386262
2008	15.708077359390156
2009	14.960209627329196
2010	14.51266241593869
2011	13.815680215792943
2012	13.968855344410967
2013	14.445269330526632
2014	14.930394537039561